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L. DRESGHER. Electro-'Magnetic Maohine- No. 221,291. Patented Nov.4,1 8'79.

"NIT'ED S'rArEs Lois Danseuse, or n PATE turion.

retains, New rome.

Specification forming part of Letters Patent No. QLQ, dated November 4, i879; application filed y March element, the object of this part of my inventiou being to produce at a reduced cost a more efcient and compact cell for portable electric apparatus than anynow in use.

* It consists, secondly, in the use of a roller orf revolving surface as an electrode in apply- `0 the current to the human body; and also nthecombination of a pair of properly-insulated jointed roller-electrodes, with a single handle to facilitate a consentaneous local application of the opposite poles of the battery for therapeutical purposes.

In the accompanying drawings, Figure l is a top view ot' a portable electro-magnetic machine tltted with my improved annular batterycell and roller-electrode; Fig. 2, a central v transverse section of the annular battery-cell complete; and Figs. 3 and 4, elevations ot" my improved bipolar roller-electrode.

e The improved battery-cup A is composed of coke, artificially prepared in like manner as is the Bunsen carbon commonly employed for use as the negative element in the cells of galvanic batteries. It is made of an annular form, as shown in Fig. 2, either by carving a suitable block of Bunsen carbon,or, prefera` bly, by molding the carbon into proper form during the process ot' its manufacture. It is rendered impervious, so asto retain the oxidating liquid ot' the galvanic cell either by soaking it in paraiiine or by resort to any other of the processes for waterproong porous materials which do not involve thc use of chemicals thatv would impair the electro -motoric power ofthe carbon, orneutralize the oxidatie, ism.

may be polygonal instead of cylindrical. This annular polygonal or cylindrical carbon cup A is secured in place for use within a suitable case by'mcans ot a pillar, B, arranged to'project through the central opening in the cup, and which affords likewise proper support i'or an annular, polygonal, or cylindrical Vplate ot' Zinc, c, constituting the positive element of the cell.

rlhe pillar B is made of hardrubber or other `insulatingmaterial, to insulate the zinc plate -from the carbon cup, and itself incloses and is supported by a central metallic rod or Wire, l), projecting from 'a metallic plate or strip xed in the bottom of the case, and to which the positive wire of the electric circuit is connected. The transverse bar c ot' the annular zinc plate c is provided with a central platina point, arranged to tit upon the upper end of the rod D, or into a socket formed thereon, whereby connection is established between the positive pole of the battery and said annular plate c, the connection of the negative pole with the carbon cupLformingthe negative element of the cell, being produced by means ot a metallic spring, E, arranged to bear lightly against the cup, as shown in Figs. l and 2.

The therapeutical application of the electric current, produced by the immersion of the .insulated zinc plate cinto vbisulphide of mercury or other suitable oXidating-liquid contained in the carbon cup A, is facilitated in this my improved apparatus by means of a bipolar electrode, illustrated Jfully in Figs. 3 and 4.

F is the central 'plate of the electrode. This plate is made of h ard rubber or other insulating material.

G G are metallic arms, hinged to said plate and thereby insulated the one from the other.

H H' are shorter bent arms, hinged to the eX- tremities ot the arms G G, and which carry rollers R R, covered with felt or other suitable absorbent material to retain moisture.

K is the handle of the electrode. It may be screwed for use into either edge ot' the central plate, F, between the arms G G The threaded aperture m. for its reception upon the one side is formed wholly in the insulating material constituting the body of the plate, as shown iu Fig. 3, so that when the handle K is inserting-liquid of the cell. The sides of the cup ed therein the arms remain insulated there rollers.

from and from each other. The threaded aperture u ou the opposite edge is made to eut the edges of metallic plates 'w w, inserted in the central plate, F,.and which extend, respectively, to the pivot-bearings of the two arms G G', so that when the metallic screw of the handle is inserted into the aperture a a continu! ous metallic connection is established thereby between the two arms G G' as Well as with the in Fig. 3, the electric current may be applied locally to the spinal column and to other'parts of the body with singular eicacy by simply passing the rollers R R, properly moistened, over the aieeted part.

The revolution ot' the rollers prevents all irritation, such as results from the friction otl ordina-ry electrodes, and the combinationI and arrangement of the two electrodes wi-tlr a single handle, so that they may bey applied with the-hand, not only insures equal anduniform pressure, but greatly facilitates the method-s and processes of beneficial application. v

The double joint-s ot' the instrument permit a' ready adjustment of its arms and rollers for various and special applications.

3 The bipolar electrode, Fig. 3, is convertible at pleasure into a single or unipolar-rollerelectro'de by screwing the handle into thel socket n, as shown in Fig. 4, and securing theappropri ate connecting-wire from the battery inl the socket t of the handle, whereupon a conneci tion will be established by this wire between the corresponding pole of the battery and both The novel concentric arrangement of an annular zinc plate,c, within an annular battery'- eup made of carbon, so as to dispense with an extra pla-te for the eleetronegativeelement ot' the cell, not only reduces the cost of the complete cell, but renders it exceedingly compact, so that it presents more active working-surface within the same space than any form of ,l

volved in the cup, increases the practical ei' ciency of the cell, for by its revolution the ox-- idating solution is readily agitated to neutralize polarization, and to overcome any inertness in the cell which may be due to differences of specific' gravity in the solution..

the central plate, c, and an electro-posit ive substance for; the cup or its lining.

I claim as my inventionl L'The combinati-on, in an ele'ctro-galvanic cell, cfa rheomotoric p-l'ate' constituting one' of its elements', with a central pivotal support insulated from the cell-cup, and' upon and about which thel plate may be' revolved, substantially 'as and for thel purpose herein set forth.

`2. The combination, with acentral insulat- I ing an`d1con'nectin'g plate' and handle, of two separate and insulated armszj'ointed to said connecting-plate', and adapted for connection with the' respective poles of an ele'ctricbattery toA constitute a bipolar` electrode for therapeuvtical purposes, su'l'rstantially as is herein set forth.

3.\A portable electrode terminating with a roller'or rollers, and adapted for th'erapeutical I I purposes, substantially asv herein set forth.

LUISA DRESOHER.

Witnesses Dir-vn)V A. BURR, Enw. J. MCGEN. 

